What Causes the Abnormal Noise During Cold Start?

[MacSabrina]

The abnormal noise during cold start is caused by: the lack of lubrication in the starter's internal gears, which affects their timely retraction. Here are more related details: 1. Causes: When starting the engine, the starter rotates to drive the flywheel, thereby starting the engine. At this point, the engine's speed is driven by the starter, so the engine speed is lower than that of the starter. Once the engine starts and its speed exceeds the starter's speed, the operator manually turns off the ignition switch to cut the power, shutting down the starter. Due to dirt buildup inside the starter and the failure of lubricating oil, the engine forces the starter to rotate at its own speed. Since there is a speed difference between the two, this results in the starter producing noise. 2. Solutions to Eliminate the Noise: The noise will only stop once the starter reaches the same temperature as the engine. However, in severe cases, the noise occurs every time the engine is started. To remove this noise, cleaning and maintaining the starter or replacing it entirely will suffice.